| 摘要 |
Naphthalimide derivatives of the formula WHEREIN R1, R2, R3, and R4 are lower alkyl, R5 is hydrogen, lower alkyl or carbamoyl methyl, n is 2 or 3, and A is an anionic radical, are effective optical brighteners for acrylic fibers and cellulose acetate when dyed from an acid aqueous bath. They are prepared by quaternizing corresponding tertiary amines with inorganic or organic acids, lower alkyl esters which are known alkylating agents, or chloroacetamide.
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